Electrically conductive particles and process for production thereof

Abstract

Conductive particles containing at least a carbon-based conductive material and a binder resin, and having an average particle size of 50 μm or less, in which a pressure for causing deformation by 40% of a particle size of the conductive particles at 25° C. is 12 MPa or less, or a mass ratio of the binder resin relative to the carbon-based conductive material is 1/99 to 70/30.

1 . Conductive particles comprising at least a carbon-based conductive material and a binder resin, and having an average particle size of 50 μm or less,
 wherein a pressure for compressing, at 25° C., a particle size of the conductive particles to 40% of the particle size under no compression is 12 MPa or less. 
 
     
     
         2 . Conductive particles comprising at least a carbon-based conductive material and a binder resin, and having an average particle size of 50 μm or less,
 wherein a mass ratio of the binder resin relative to the carbon-based conductive material is 1/99 to 70/30. 
 
     
     
         3 . The conductive particles according to  claim 1 , wherein the binder resin contains a non-water soluble elastic resin. 
     
     
         4 . The conductive particles according to  claim 3 , wherein the binder resin further comprises a water soluble resin. 
     
     
         5 . The conductive particles according to  claim 3 , wherein a glass transition temperature (Tg) of the non-water soluble elastic resin is −30° C. to 110° C. 
     
     
         6 . The conductive particles according to  claim 1 , wherein the carbon-based conductive material is carbon black. 
     
     
         7 . The conductive particles according to  claim 1 , wherein the carbon-based conductive material is Ketjen black. 
     
     
         8 . A method of production of conductive particles, spraying a composition in which a carbon-based conductive material and a binder resin are mixed in a medium and a mass ratio of the binder resin relative to the carbon-based conductive material is 1/99 to 70/30 to volatilize the medium, and to granulate the composition while binding the carbon-based conductive material with the binder resin. 
     
     
         9 . The method of production according to  claim 8 , wherein an average particle size of the conductive particles is 50 μm or less. 
     
     
         10 . The method of production according to  claim 8 , wherein the binder resin comprises a non-water soluble elastic resin. 
     
     
         11 . The method of production according to  claim 10 , wherein the binder resin further comprises a water soluble resin. 
     
     
         12 . The method of production according to  claim 10 , wherein an average particle size of the carbon-based conductive material is 10 nm to 700 nm and an average particle size of the non-water soluble elastic resin is 50 nm to 700 nm. 
     
     
         13 . The conductive particles according to  claim 2 , wherein the binder resin contains a non-water soluble elastic resin. 
     
     
         14 . The conductive particles according to  claim 13 , wherein the binder resin further comprises a water soluble resin. 
     
     
         15 . The conductive particles according to  claim 13 , wherein a glass transition temperature (Tg) of the non-water soluble elastic resin is −30° C. to 110° C. 
     
     
         16 . The conductive particles according to  claim 2 , wherein the carbon-based conductive material is carbon black. 
     
     
         17 . The conductive particles according to  claim 2 , wherein the carbon-based conductive material is Ketjen black.